Lock construction



Maly-28, 1935. f w. E. KELLER Y Loox CONSTRUCTION Filed Feb. 8,l 1932 Patented May 28, 1935 v.

y i UNITED STATES- Y 2,003,083 f fLocK CONSTRUCTION Walter E. Keller, Elkhart, nur, assignor te The Adlakc Company, Chicago, Ill., a corporation ofY l Illinois Application February s, 1932, serial No. 591,530 I 4 claims. '(01. 292-197) 'I'his invention has todo with locks or" the type used on railway car and motor bus window sash.' f.

The principal object of the invention is to provide an improved lock whichis .characterized by the inclusion of a rack-engaging member of novel construction, arrangement and operation.

While the foregoing statement Vis indicative of the'nature' of the invention, other more specific objects and advantages will be apparent to those skilled in the art upon a full understanding of the parts which together constitute the improved lock.

A preferred embodiment of the invention is presented herein by` way of illustration, but it will of course be appreciated that the invention is susceptible of embodiment in other structurally modified forms coming equally within the scope of the appended claims.

In the. accompanying drawing:

Fig. 1 is a fragmentary face view of one corner' of a sash equipped with the lock of the invention;

Fig. 2 is a horizontal section, taken on Athe line 2-2 of Fig'. 1;

Fig. 3 isja vertical'section taken on the line 3 3 of Fig. 1;

Fig. 4 is a vertical section taken on the irregular line 4-4 of Fig. 2; and

Fig. 5 is a View which corresponds to Fig. 4 but shows the rack-'engaging member of the lock in its inoperative position.

Referring in detail to the drawing, it will be observed that the improved lock is shown as being mounted on one of the lower corners of a vertically movable car or bus window sash I6. The sash I0, which may be of any suitable construction, is positioned between an outer stop II and an inner stop I2, and the lock on the sash is adapted to coact with a lock rack I3 which faces toward the sash and is contained Within a channel I4 which is formed in the inner stop I2. The rack I3, which may be of any suitable construction, contains a plurality of inclined seats I5 with which a pawl I6 on the sash is adapted to engage.

The pawl I6 is housed Within a small vertically elongated rectangular casing I'I, and the casing` I1 is in turn set into a recess I8 in the edge of the sash, preferably ilush with the latter, in which position it is secured by two or more screws I9. The side of the casing I 'I which faces toward the rack I3 is open, whereby to permit the pawl I6 to operate through the same.

The pawlV I6 is pivotally mounted at its upper end on a pin 2i) Ywhich allows the pawl to swing in a vertical plane at right angles to the plane of the sash from. a vertical position within the casing to'an inclined position wherein the lower 5 end or nose 2l of the'pawl protrudes from the i inner face ofthe sash and engages with any one of the seats I5 in the rack. The projected or inclined position of the pawl I6 is shown in Figs. 1,. 2, Band 4, While the vertical or retracted 10r positionof the pawl `is shown inv Fig. 5; i

VThe pawl- I6 is operated by a `bolt 22 which is slidably mounted in a horizontal guideway 23 in the bottom rail of the sash;l The guideway 23 opens into the casing. i'I-"through a passage 15.' 24 vin the adjacent side Wallof Vthe latter' andiis urged in the direction of the pawlv I6 by-` a coil spring 25 which is compressed between the rear end of the bolt and the rear end of the guideway. The bolt is adapted tobe 'retracted against the 20 action of the spring 25 bymeansiof a nger piece 26jwhich extends into a hollowed out portion vof a lock plate 21. The plate 2l is attached to the bottom rail of the sash by a' number of Ascrews 28 and is provided with a lift 25 ange 29 in underlying relation to the exposed portion of the' finger piece forcoaction with the latter. The finger piece 26 is pivotally attached to the plate 21 at 30 and is provided with a study 3l which extends laterallyl through an arcuate 30 slot in the adjacentY wall of the bottom rail into a vertically extending groove 32 in one side ofthe bolt 22, all asV clearly shown in Fig. 2. The front end of the bolt is beveledas shown in Figs. 2, 3 and 4 to provide a rearwardly and 35 downwardly inclined nose 33 forV camming coaction with the back of the pawl I6.

When the linger piece 26 is depressed, as shown in Fig. 5, to withdrawthe nose 33 from the pawl I6 against the yielding resistance of 40 the spring 25, the pawl will be released and will swing down under its own weight into a vertical non-.projecting position Within the casing Il, free from engagement with any of the seats I5 in the rack I3, in which position of the pawl 45 the sash may be easily raised or lowered in the guides. When the finger piece 26 is released, however, the spring 25 will project the nose 33 of the bolt against the adjacent back corner 34 of the pawl, which corner is preferably rounded 50v oif or beveled, and willl cam the nose 2| of the pawl outwardly intor wedged engagement with the rack, in vertically interlocking engagement with one of the seats I5 in the latter.

The angle at which the bolt 22 bears against 55 the pawl I6 in the fully projected position of the latter is preferably so slight as to prevent anyy force on the pawl in the opposite direction, no

matter how great, from backing up the spring' pressed bolt, thereby producing an interlocking cooperation of the rack, pawl and vbolt which effectively preventsthe sash being raised fromv closely adjacent to the topof the casing |71 in" approximate contact with the under surface 36 of the latter, whereby to in some measure relieve tlie pin 2D from the severe end shocks to which the pawl is subjected when the sash is allowed to drop a little in being locked in a raised position; This additional back stop re'- inforcement for the pin will of course come into play more and more as wear develops between the pin and the pawl.

The casing il is preferably provided with an aperture 31 in'opposition tothe aperture 24, through which the bolt 22 may be withdrawn or inserted without necessitating` 'removal of the casing Il. V

Should the spring 25 break or become inoperative for any other reason, there is no danger of theV sash dropping and causing injury, since .the inclined position of the pawl I6, through the action of the weight of the sash thereon, will provide Va stable support for the sash which is .entirely independent of the action of the bolt 22.v This inclined position of the pawl will'also always maintain the sash tight against the outer stop ll when the sash is being supported in Vany one of its raised positions.V Y

To lower the sash I6 from any of vthese raised positions, it is merely necessary to depress the nger piece 26 and raise the sash just far enough to relieve the pressure on Ythe bolt I6 Y and allow the latter to swing back into Vthe casing I'I.Y

The casing Il may advantageously be provided f aooaoss at its lower end with a projection 38 which extends beneath and interlocks vertically with the adjacent end of the sheet metal guideway 23 whereby to materially strengthen the entire lock assembly.

I claim:

V1. The combination with a vertically movable sash, and a lock rack inA opposition to the insideface of the same, of a pawl pivotally mounted on the sash for swinging movement into engagement with the rack, and a bolt slidably mounted on the sash at right angles to the direction of `movement of the pawl for camming coaction with the latter. Y

.2. The combination with a vertically movable sash,and alock rack in opposition to the inside face of the sash, of a pawl pivotally mounted on the sash for swinging movement into engagement with the rack, and a springprojected bolt slidably mounted on the sash at right angles to the Vdirection of movement of the pawl for camming coaction Vwith the latter, said bolt in its projected position engaging with the pawl at such an angleV as to prevent return movement of the pawl.

3. The combination with a vertically movable sash, and a lock rack in opposition to the inside iace of the sash, of a pawl pivotally mounted at its upper` end on the sash with its lower end free to swingoutwardly away from the inside faceV of the sash into engagement with the rack, and a spring-projected bolt slidably mounted on the sash at right angles to the direction of movement of the pawl and provided with a beveled nose for yforcing the lower end o the pawl outwardly into Vengagement with the rack.

4. The combination with a vertically movable sash, and a lock rack in opposition to the inside face of vthe sash, of a pawl pivotally mounted on the sash vfor swinging movement into engagement with the rack, and a springprojected bolt slidably mounted, on the sash at right angles to the direction of movement of the pawl for camming coaction with the latter.

. WALTER E. vKELLER. 

